How do I bend a scanned .stl object with several complex features
Ok, not having your exact object, and having not well understood your question I should probably avoid inserting an answer here, but I wish to show an easy way you could &quot;roll up&quot; that plane to a &quot;cylindrical&quot; shape, since it could give you some ideas on how to proceed. Then maybe you can suggest if some variant could be better.
Note, I simulated a flat rectangular object with irregular vertices (I randomized them): I know it's not as your object, which seem far less easy to be deformed than mine, but if you could arrange your object, subdividing it a lot perhaps, the following could fit your case too. Maybe.
Here it goes:

Here is my &quot;simulation&quot; of your flat rectangular object, with its red twin I leave there for comparison



in the same &quot;object center&quot; I add a &quot;curve circle&quot;, from top view



obtaining this



Then I select the grey rectangular object and insert a curve modifier, targeting the bezier circle just inserted before



...and I get this horrible shape! But don't worry, it's just the circle, too little. We're going to fix it.



Now, I zoomed a bit to show you better, but I selected (see the upper right outliner area) the bezier circle



Then I enter the edit mode with TAB and select all control points



Then I scale it outwards, perhaps too much in the picture below, but at least now I can see where my curved surface ends are, which should probably stick together



...and I can make then stick together just by scaling a bit less (some snapping to grid could help while scaling)



Exiting edit mode, this is what I get.


As said above your object could not follow the curve so easily, and it could need to be subdivided, maybe with subsurf modifier applied in advance. Or, you could give us hints on how exactly you need it to be.
You could share your object, also, preferably using this dedicated hosting service and then pasting in your question the provided link:
http://blend-exchange.giantcowfilms.com/